# CVE-2019-18180: Denial of service

> Remote attackers can cause an endless loop and denial of service in OTRS by submitting filenames with overly long extensions.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 5 Dec 2019
- **Updated:** 16 Sep 2024
- **Also known as:** DEBIAN-CVE-2019-18180, GHSA-9g8p-x3jv-xwc5, UBUNTU-CVE-2019-18180

## What is CVE-2019-18180?

CVE-2019-18180 is a medium-severity denial of service vulnerability in Otrs Otrs, published on 5 Dec 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper Check for filenames with overly long extensions in PostMaster (sending in email) or uploading files (e.g. attaching files to mails) of ((OTRS)) Community Edition and OTRS allows an remote attacker to cause an endless loop. This issue affects: OTRS AG: ((OTRS)) Community Edition 5.0.x version 5.0.38 and prior versions; 6.0.x version 6.0.23 and prior versions. OTRS AG: OTRS 7.0.x version 7.0.12 and prior versions.

Weakness: CWE-835 (Loop with Unreachable Exit Condition)

## Which versions are affected by CVE-2019-18180?

It affects 1 product.


Products: Otrs Otrs.

## How do I fix CVE-2019-18180?

Upgrade to a fixed version.

## Is CVE-2019-18180 being exploited?

There is no known exploitation of CVE-2019-18180 in the wild and no public exploit code.

## Other vulnerabilities in Otrs Otrs

- [CVE-2026-48188](https://insights.sbomify.com/CVE-2026-48188/): SQL Injection via MySQL Quote Method (critical 9.1)
- [CVE-2013-4717](https://insights.sbomify.com/CVE-2013-4717/): SQL injection in n/a (high 8.8)
- [CVE-2017-14635](https://insights.sbomify.com/CVE-2017-14635/): Code injection in n/a (high 8.8)
- [CVE-2023-5422](https://insights.sbomify.com/CVE-2023-5422/): SSL Certificates are not checked for E-Mail Handling (high 8.7)
- [CVE-2023-6254](https://insights.sbomify.com/CVE-2023-6254/): Password is send back to client (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-18180 and fix it if it is affected.

What it is: CVE-2019-18180 is a medium-severity denial of service vulnerability in Otrs Otrs, published on 5 Dec 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-18180 in the wild and no public exploit code.

Affected product: Otrs Otrs. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2019-18180/ (Markdown: https://insights.sbomify.com/CVE-2019-18180/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-18180
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-18180
- OSV: https://osv.dev/vulnerability/CVE-2019-18180

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-18180/
Summaries are generated and may contain mistakes; the official description above is the record.